In Gyruss, you pilot a small spaceship trying to make its way from outer Neptune to Earth. Along the way you will encounter waves of alien attackers. These enemy aliens fly in a variety of patterns while trying to block your path. As if that were not enough, you must also avoid satellites and meteors.
Your progress toward Earth can be tracked as you reach each planet between Neptune and Earth -- Uranus, Saturn, Jupiter and Mars. When you reach Earth you have completed the game. However, the game will start over from the beginning and will only end when you lose all of your ships.